HP Netserver L Server series - Manual (Page 85)

Chapter 9 Connecting the Monitor, Keyboard, Mouse, and UPS
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Figure 9-3. Removing the Power Supply Filler Panel
2. Before installing the new power supply module, pinch the release and pull
it down. See Figure 9-4.
NOTE The release lever on the power supply module must be in
the down position in order to install the module.
Release Lever
Figure 9-4. Moving Release Lever Down